\documentclass[10pt,a4paper]{article}

% Packages
\usepackage{fancyhdr}           % For header and footer
\usepackage{multicol}           % Allows multicols in tables
\usepackage{tabularx}           % Intelligent column widths
\usepackage{tabulary}           % Used in header and footer
\usepackage{hhline}             % Border under tables
\usepackage{graphicx}           % For images
\usepackage{xcolor}             % For hex colours
%\usepackage[utf8x]{inputenc}    % For unicode character support
\usepackage[T1]{fontenc}        % Without this we get weird character replacements
\usepackage{colortbl}           % For coloured tables
\usepackage{setspace}           % For line height
\usepackage{lastpage}           % Needed for total page number
\usepackage{seqsplit}           % Splits long words.
%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
\usepackage{amsmath}            % Symbols
\usepackage{MnSymbol}           % Symbols
\usepackage{wasysym}            % Symbols
%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{Dison}
\pdfinfo{
  /Title (fe-interview.pdf)
  /Creator (Cheatography)
  /Author (Dison)
  /Subject (FE Interview Cheat Sheet)
}

% Lengths and widths
\addtolength{\textwidth}{6cm}
\addtolength{\textheight}{-1cm}
\addtolength{\hoffset}{-3cm}
\addtolength{\voffset}{-2cm}
\setlength{\tabcolsep}{0.2cm} % Space between columns
\setlength{\headsep}{-12pt} % Reduce space between header and content
\setlength{\headheight}{85pt} % If less, LaTeX automatically increases it
\renewcommand{\footrulewidth}{0pt} % Remove footer line
\renewcommand{\headrulewidth}{0pt} % Remove header line
\renewcommand{\seqinsert}{\ifmmode\allowbreak\else\-\fi} % Hyphens in seqsplit
% This two commands together give roughly
% the right line height in the tables
\renewcommand{\arraystretch}{1.3}
\onehalfspacing

% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
\newcommand{\mymulticolumn}[3]{\multicolumn{#1}{>{\columncolor{\RowColorName}}#2}{#3}} % For coloured multi-cols
\newcolumntype{x}[1]{>{\raggedright}p{#1}} % New column types for ragged-right paragraph columns
\newcommand{\tn}{\tabularnewline} % Required as custom column type in use

% Font and Colours
\definecolor{HeadBackground}{HTML}{333333}
\definecolor{FootBackground}{HTML}{666666}
\definecolor{TextColor}{HTML}{333333}
\definecolor{DarkBackground}{HTML}{A3A3A3}
\definecolor{LightBackground}{HTML}{F3F3F3}
\renewcommand{\familydefault}{\sfdefault}
\color{TextColor}

% Header and Footer
\pagestyle{fancy}
\fancyhead{} % Set header to blank
\fancyfoot{} % Set footer to blank
\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
    \SetRowColor{DarkBackground}
    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
    }
\end{tabulary}
\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{FE Interview Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{Dison} via \textcolor{DarkBackground}{\uline{cheatography.com/143365/cs/30802/}}}
\end{tabulary}
\end{multicols}}

\fancyfoot[L]{ \footnotesize
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}Dison \\
  \uline{cheatography.com/dison} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 6th February, 2022.\\
   Updated 9th February, 2022.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
  \SetRowColor{white}
  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
\raggedright
\raggedcolumns

% Set font size to small. Switch to any value
% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
\footnotesize % Small font.

\begin{multicols*}{2}

\begin{tabularx}{8.4cm}{x{2.4 cm} x{5.6 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{React Setup}}  \tn
% Row 0
\SetRowColor{LightBackground}
Add Script & \textless{}script src="foo.com/react.js" crossorigin /\textgreater{} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
Add targeting div & \textless{}div id="react" /\textgreater{} \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
Get root Dom & root = \seqsplit{document.getElementById("root");} \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
Bootstrap React & ReactDOM.render(\textless{}App /\textgreater{}, rootElement); \tn 
% Row Count 8 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{React Hooks}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{const {[}state, setState{]} = useState(initialState);} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{useEffect(() =\textgreater{} \{ ...logic, return cleanup\}, {[}deps{]});} \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{useMemo(() =\textgreater{} computeExpensiveValue(a, b), {[}a, b{]});} \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{Context \{\{nl\}\}~~ ThemeContext = \seqsplit{React.createContext(themes.light);} \{\{nl\}\}~~ \textless{}ThemeContext.Provider value=\{themes.dark\}\textgreater{} \{\{nl\}\}  \{\{nl\}\}~~ theme = \seqsplit{useContext(ThemeContext);} \{\{nl\}\}~~ background: theme.background} \tn 
% Row Count 10 (+ 5)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{useRef \{\{nl\}\}~~ const inputEl = useRef(null); \{\{nl\}\}~~ \textless{}input ref=\{inputEl\} /\textgreater{} \{\{nl\}\}~~ inputEl.current.focus();} \tn 
% Row Count 13 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{async useEffect}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{8.4cm}}{useFetch = (param) =\textgreater{} \{ \newline   const {[}state, setState{]} = useState({[}{]});   \newline  \newline   useEffect(() =\textgreater{} \{ \newline     async function fetchData() \{       \newline       const response = await fetch('url');       \newline       const data = await response.json(); \newline  \newline       setState((prev) =\textgreater{} \seqsplit{prev.concat(data.results));}       \newline     \} \newline     fetchData(); \newline   \}, {[}param{]}); \newline  \newline   return \{ state \}; \newline \};} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{3.04 cm} x{4.96 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{JS Arrays}}  \tn
% Row 0
\SetRowColor{LightBackground}
Insert at Start & unshift() \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
Insert at End & push() \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
Insert at Location & splice(start, 0, item2, itemN) \tn 
% Row Count 4 (+ 2)
% Row 3
\SetRowColor{white}
Remove First & shift() \tn 
% Row Count 5 (+ 1)
% Row 4
\SetRowColor{LightBackground}
Remove Last & pop() \tn 
% Row Count 6 (+ 1)
% Row 5
\SetRowColor{white}
Remove at Location & splice(start, deleteCount) \tn 
% Row Count 8 (+ 2)
% Row 6
\SetRowColor{LightBackground}
Get parts & slice(start, end) \tn 
% Row Count 9 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{p{0.8 cm} x{7.2 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Algos}}  \tn
% Row 0
\SetRowColor{LightBackground}
DFS & getNodes(root) \{\{nl\}\}~~ {[}...getNodes(root.left), getNodes(root.right){]} \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
BFS & while(queue.length)\{\{nl\}\}~~for(queue.length) \{\{nl\}\}~~~~ node = queue.shift() \{\{nl\}\}~~~~ \seqsplit{queue.push(node.left/right)} \tn 
% Row Count 8 (+ 5)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{Big-O}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{p{8.4cm}}{\vspace{1px}\centerline{\includegraphics[width=5.1cm]{/web/www.cheatography.com/public/uploads/dison_1644382450_1_5ZLci3SuR0zM_QlZOADv8Q.jpeg}}} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}